I have a nice vent window for my 67 Barracuda from my auto recycler, and I'm trying to replace the window and channel. So far I've removed the lower bracket nut and bolt, the nut from the leading edge of the door, and the philips screw from the metal part of the interior door panel. The FSM and Haynes are both short on info, and say to disengage the arm from the lower front window channel which I can't seem to do. The whole thing see-saws back and forth, but nothing will give. What am I missing?

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/6 '67 Barracuda convertible, electronic ignition, 4-OD, street cam, SBP KH discs, 3.55 SG 7.25" 1" t-bars. Bilstein.
340 '67 fastback, Doug Nash 5-speed.
1988 Toyota pickup work truck

Took another look at the diagram, and saw that the front door glass rear channel could be removed which is what I did, and it all worked out.

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/6 '67 Barracuda convertible, electronic ignition, 4-OD, street cam, SBP KH discs, 3.55 SG 7.25" 1" t-bars. Bilstein.
340 '67 fastback, Doug Nash 5-speed.
1988 Toyota pickup work truck